Does anyone celebrate Kwanzaa?

To me it sounds like a ceremony in which people isolate themselves and reinforce racist tendencies on both sides of the fence. Does anyone really celebrate it?

To put it in perspective: my wife is Irish-American, and Irish people were seriously oppressed (and indentured in servitude, not slavery, but still bad), and she doesn’t dress up in traditional garb and speak gaelic on St. Patrick’s day.